Best approach is to try and minimize the potential for toddler temper tantrums in the first place. Having a set naptime during the day and bedtime at night sets a routine and the toddler will resist throwing tantrums.
A great way to mitigate toddler temper tantrums is to be very clear with your child what you will be doing as you go through each day. Trips to the store and running general errands may not turn out to be problems if the child knows what to expect. Knowing your child’s moods well can help you to understand his moods.
Some meltdowns cannot be avoided. Remind yourself that yelling at the child will only make things worse. Stay calm, and let your voice reflect this. Tell the child you will count to five. This may help the child to snap out of it. If not, simply give the child a time-out. Have a set place where the child goes when they are in trouble. The usual rule of thumb is to have them sit in time-out for one minute of every year of their age.